Bag making machine



Oct. 23, 1934. ROYAL BAG MAKING MACHINE Filed June 7, 1930 Patented a.23, 1934 BAG MAKING MACHINE Thomas M. Royal, Philadelphia, Pa.

Application June 7, 1930, Serial No. 459,690

7 Claims.

My invention relates to bag making machines and more particularly to themeans for severing a tubular web into sections of desired length fromwhich the bags are formed. While it is adapted for use in the severingof paper of various thicknesses commonlyemployed in the manufacture ofbags yet it is especially well adapted for and useful in the manufactureof bags of thin paper, particularly the very thin transparent product 10known in the trade as cellophane.

While the invention is illustrated as embodied in a machine for themanufacture of bags it is to be understood that it may be employed inany case where it is desired to sever sheets of paper 16 at intervals soas to divide a web of paper of relatively great length successively intoa number of sections of any desired length.

The general object of the invention is to provide means for cooperationwith severing 20 means employed in a bag machine or other similarmachine for facilitating the severing of a sheet or web of papersuccessively into sections of desired length.

It also is an object of the invention to provide means of novelconstruction for cooperation with the severing means of a bag making orother similar machine which will cause the severing instrumentality tosever the paper without tearing it in directions transversely of theline along which it is severed.

A further object of the invention is to provide means of novelconstruction for cooperation with the severing means employed in thecutting of a tubular web of paper employed in the manufacture of bags totake up the slack in the web of paper in adjoining relation to theforming means employed in such machines to thereby prevent jamming ofthe paper between cutting ends provided upon and adjacent to the forming40 means and the severing knife or other cutting instrumentality.

A still further object of the invention is to provide means of novelconstruction for controlling the slack in the section of web inadjoining relation to the rear end of the forming means to therebyfacilitate the severing of such section from the remaining portion ofthe web of paper which is being severed into sections of greater or lesslength.

Without attempting to set forth at this point in the specification otherobjects and advantages of the invention I shall now proceed with adetailed description thereof wherein other ob- 55 jects and advantageswill be specifically referred to or else will become apparent fromsuchdescription.

In order that the invention may be readily understood and its practicaladvantages appreciated reference should be had to the accompanyingdrawing wherein I have illustrated one mechanical embodiment of theinvention. However it is to be understood that the invention may beembodied in other forms of construction than that shown and that changesin the details of construction may be made within the scope of theclaims without departing from the invention or the principle thereof.

In the drawing:

Fig. 1 is a longitudinal elevation, partly in section, 'of a portion ofa bag making machine provided with means embodying my present invention.

Fig. 2 is a similar view showing a portion of the structure illustratedin Fig. 1, certain of the parts being in different positions from thoseshown in Fig. 1.

3 is a view similar to that shown in Fig. 2 with certain parts in stillanother position.

Fig. 4 is a sectional view taken on the line IV-IV of Fig. 1; showing afragmentary portion of the structure, and

Fig. 5 is a sectional view taken along the line V--V Fig. 1; showing thetubular web in cross section and a portion of the means for controllingthe slack in the section of web which is to be severed.

Referring to the drawing, I have shown at 1 a portion of the frame of amachine, being a bag making machine in the construction illustrated,upon which the various instrumentalities embodying the invention aremounted.

As already indicated, the invention is illustrated as being embodied ina bag machine which includes means, not shown, for folding a web ofpaper about the former, as is usual. The web is folded into tubular formand is fed rearwardly toward the bag forming mechanism in part at leastby the feed rollers 2. The rear end of the former is shown at 3 and itis provided with downwardly extending saw-teeth 4 which cooperate withthe upwardly moving severing knife 5 for severing the lower wall or plyof the flattened tubular web 6. The upper wall or ply of the saidtubular web is severed by the co-action of the knife 5 with thesaw-teeth 7 provided upon the rear edge of a plate 8 supported uponsuitable brackets, one of which is shown at 9, above the upper wall orply of said web 6. The severing knife 5 is of usual construction and ismounted as usual upon a disc The shaft 11 with the disc lothereon isrotated in the usual manner by means of gears, not shown.

The tubular web 6 extends from the rear end of the former 3 to slackerrolls 15, suitably rotated; the speed of rotation of these rolls beingsuch as ,to cause the formation of slack in the section of web 6 betweenthe rear end of the former 3 and the said rolls. The severed sections ofmaterial go from the slacker rolls to the creaser and paster rolls 20.

The construction as thus far described is known and for that reason itis believed to be unnecessary to describe the same in greater detail.

Heretofore in the severing of tubular webs of paper in the manufactureof bags or for other purposes it has not been customary to control theslack in the section of the web 6- between the rear end of the former 3and the slacker rolls 15 and in consequence it sometimes happens thatthe paper doubles up and jams against the rear end' of the former, thusinterfering with the efllcient operation of the severing means, and italso sometimes happens that the paper is split in directionstransversely of the line along which it is being severed, thus resultingin multilation of the severed section rendering it unfit for use eitherin the manufacture of a bag or for such other purpose as it may havebeen intended.

I have found that by taking up or partially taking up the slack presentin the section 6* between the rear end of the former 3 and the slackerrolls 15 and controlling the same during the severing operation I amenabled to cause the severing means to sever the web of paper withoutniutilating the same, and also am enabled to prevent jamming of thepaper against the rear end of the former. Thus the efficiency of theapparatus is greatly enhanced.

For the purpose of taking up and controlling the slack of the section 6*during the severing operation I have provided a member for contactingwith the said section together with means for causing said member tomove toward and from the said section and to contact with the same inproper timed relation to the movements of the severing knife 5.

In the construction illustrated the contact member 25, whose top edge isadapted to contact with the under wall or ply of the section 6 of theweb 6, is mounted upon the upper end of a rod or bar 26 which ispivotally connected at 27 to the upper end of a connecting rod 28 thelower end of which is adjustably connected with the outer end portion ofa lever 29. For the purpose of connecting the lower end of theconnecting rod 28 to the outer end portion of the lever 29, said outerend portion is provided with a slot 30 which is adapted'to be engaged bya bolt 31 by which the lower end of the said rod is fastened in adjustedposition to the said lever. The lever 29 is pivoted intermediate itsends upon a pivot 32 mounted upon a bracket 33 which is adjustablymounted upon-a stationary support 34 mounted upon the frame of themachine. The bracket.

33 is held in adjusted position by means of a set screw 35. The end ofthe lever 29 oppofite its slotted portion 30 is provided with a frictionwheel 36 which is in engagement with a cam 37 mounted upon a shaft 38having a sprocket wheel 39 thereon in engagement with a sprocket chain40. The opposite portion of the said sprocket chain is in engagementwith a sprocket wheel 41 upon the driving shaft 43 upon which one of theslacker rolls 15 is mounted. Upon rotation of the shaft 38 the lever 29is oscillated to cause reciprocatory movements of the connecting rod 28and the rod or bar 26 connected thereto. The upper end of the bar 26extends through an opening 45 in a stationary bar 46. A spring isinterposed betweenthe lower side of the bar 46 and a shoulder 51 at thelower end of the said bar. The said spring is under compression andtends to hold the said bar 26 and the connecting rod 28 in theirlowermost positions. When the high part of the cam 37 contacts with theroller 36 upon an end of the lever 29 the opposite end of the latter iselevated so as to move the contact member 25 upwardly into engagementwith the section 6 of the tubular web to' control the amount of slack inthe latter. The movements of the contact member 25 take place in timedrelation to the movements of the severing knife 5. That relationship issuch that practically simultaneously with the beginning of the severingoperation the contactmember 25 begins its downward movement so that atthe moment of severing the section 6 from the remaining portion of thetubular web the said section is not held taut but nevertheless theamount of slack therein is controlled so as to prevent doubling up andjamming of portions of the paper between the knife 5 and the rear end ofthe former 3. It may be noted that while the necessary gearing is notshown, the shaft 11 and the shaft 38 are driven from the same shaft 43.

Upon reference to Fig. 4 of the drawing it will be noted that thecutting edge of the severing knife 5 during the "cutting operation islocated in a plane which makes a small angle with the plane of theformer 3 so that severing or shearing of the under wall or ply of theweb 6 is effected first at one edge thereof 'and successively throughoutits width, being in that respect to the shearing action of a pair ofscissors or shears. Substantially the same cooperation takes placebetween the severing or cutting edge '7 of the knife 5 and the cuttingedge portion of the cutter plate 8.

Although in the construction illustrated the contact member or device 25is mounted upon a reciprocable bar 26 yet it will be understood thatsuch contact member or device may be mounted and operated in any othermanner found to be desirable and at the same time practical. Theessential thing is that means be provided for controlling the slack inthe portion or section 6 of the web which is being severed from theremaining portion of said web.

As has been indicated already, the invention may be employed forcontrolling the slack in papers ofwarious kinds and'of variousthicknesses but it is particularly useful when employed for controllingthe slack of very thin papers such, for example, as that known in thetrade under the name of cellophane.

Although the invention is illustrated as embodied in a machine for themanufacture of bags wherein a flat web of paper is converted intotubular form in known manner, yet the invention may be employed'forcooperation with the severing means in the severing. of a single sheetor web of paper. The latter, as already indicated, my boot variousthicknesses. However, the invention is of especial value and utilitywhen employed for cooperation with the severing means for the purpose ofsevering sheets or tubular webs of extremely thin paper of the characterhereinbefore indicated. 1

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. In a machine of the character described, thecombination of means forsevering sections of paper from a continuously moving web of paper; saidmeans causing slackness in said web, and means for controlling the slackportion of said web to position said slack portion in the section of theweb that is severed whereby the slackness does not accumulate in thefollowing portion of the web but is removed with the severance of eachweb section.

2. In a machine of the character described, the combination of means forsevering sections from a continuously moving sheet of paper ofindefinite length; said severing means causing slack in said sheet, andmeans controllingsaid slack to cause it to occur in the severed sectionof the sheet.

3. In a machine of the character described, the combination of means forsevering sections from a sheet of indefinite length, means producingslack in said sections previous to their severance, a device forcontrolling the slack and located adjacent to the section to beimmediately severed at the moment of severance. and means for movingsaid device toward and from succeeding sections of the sheet; saiddevice holding said sections in deflected relation to a horizontal planeduring the cutting action of the severing means.

4. In a machine of the character described, the combination of means forsevering sections from a continuously moving web of paper, with meansfor causing the slackness present in the web and occasioned by thesevering operation to be accumulated in the section severed from theweb.

5. In a machine of the character described, the combination of means forfeeding a web of paper longitudinally through the said machine, severingmeans for cutting sections of desired length successively from the saidweb, a contact device located in proximity to a side of a section to besevered, yielding means tending to hold the said device away fromsaid'section, and means for causing reciprocatory movements of saidcontact device toward and from said section; the m itial movement ofsaid contact device away from said section taking place practicallysimultaneously with the cutting operation of the said severing means.

6. In a machine of the character described, the combination of means forfeeding a web of paper through said machine, severing means forsuccessively cutting sections of desired length from said web, means forproducing slack in the said successive sections, a contact device forcontacting with saidsections to control the amount of slack therein, areciprocable bar for supporting said contact device, a connecting rodhaving pivotal connection with an end of said reciprocable bar, andmeans for actuating the said connecting rod for causing reciprocato ymovement of the said bar and the contact device carried thereby.

7. In a bag making machine, the combination with means for severingsections from a tubular web of indefinite length, slacker rolls forproducing slack in the successive sections prior to severance, a knifefor severing said sections successively from the said web, a contactdevice located in adjoining relation to one wall or ply of a section tobe severed, and means for moving said device transversely to deflect asection from the plane of the web from which it is being severed tothereby control the slack in said section at the moment of severance andretaining said section in deflected position during the severingoperation.

THOMAS M. ROYAL.

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